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ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet parse_tag_3_packet() set encrypted_key_size from the Tag 3 packet body without bounding it against ECRYPTFS_MAX_KEY_BYTES (64). When encrypted_key_size > 64, decrypt_passphrase_encrypted_session_key() sets decrypted_key_size = encrypted_key_size and performs two out-of-bounds writes: 1. crypto_skcipher_decrypt() writes encrypted_key_size bytes into decrypted_key[64] via scatterlist, overflowing into the parent ecryptfs_auth_tok struct. 2. memcpy(crypt_stat->key, decrypted_key, decrypted_key_size) writes into crypt_stat->key[64], corrupting root_iv, keysig_list, and mutexes in ecryptfs_crypt_stat. Only AES-192 (cipher code 0x08) enables this because it sets crypt_stat->key_size = 24 independently of encrypted_key_size, allowing crypto_skcipher_setkey() to succeed while encrypted_key_size exceeds ECRYPTFS_MAX_KEY_BYTES. The PKI decryption path (parse_tag_65_packet) already validates decrypted_key_size <= ECRYPTFS_MAX_KEY_BYTES; the passphrase path omits this check. Bound encrypted_key_size against ECRYPTFS_MAX_KEY_BYTES (64) rather than ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES (512). The 64-byte limit also protects the 512-byte encrypted_key[] buffer, so the former 512-byte check is removed as redundant. [tyhicks: Adjust the code comment to refer to macros representing the buffer sizes rather than mentioning the buffer size values since they may change

Announced Source revision 1
Original source ↗

CVE-2026-89607

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89607

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "237fead619984cc48818fe12ee0ceada3f55b012",
        "lessThan": "2cd21340163494d312836c77c9fbfe2530b3d075",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "237fead619984cc48818fe12ee0ceada3f55b012",
        "lessThan": "e2152d491ae62d96a32ed59778680a242af1fbc6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "237fead619984cc48818fe12ee0ceada3f55b012",
        "lessThan": "d2802414081184f79a619ede178aeef3aa989793",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "237fead619984cc48818fe12ee0ceada3f55b012",
        "lessThan": "33e050cac841498b5175f0f385eee903fd98863c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "237fead619984cc48818fe12ee0ceada3f55b012",
        "lessThan": "ccd13eff0e7356d2aa28b127b577e4e5ad4563f5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "237fead619984cc48818fe12ee0ceada3f55b012",
        "lessThan": "14cb36a500a5a3afbc955dbf69dabc565f1a3b26",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "237fead619984cc48818fe12ee0ceada3f55b012",
        "lessThan": "a419c9ebfc9a40ee56aaad6dc68bfd67d400817b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "237fead619984cc48818fe12ee0ceada3f55b012",
        "lessThan": "5babe9c177c364521e3e682b949c5a8c47f4a441",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ecryptfs/keystore.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.109",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ecryptfs/keystore.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89607

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#35113 · Revision 1
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Publisher date
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